/**
 * Copyright (c) 2002-2017 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.neo4j.driver.internal.value;

import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import org.neo4j.driver.internal.types.InternalTypeSystem;
import org.neo4j.driver.internal.util.Extract;
import org.neo4j.driver.v1.util.Function;
import org.neo4j.driver.v1.types.Type;
import org.neo4j.driver.v1.Value;
import org.neo4j.driver.v1.Values;

import static org.neo4j.driver.internal.util.Format.formatElements;
import static org.neo4j.driver.internal.value.InternalValue.Format.VALUE_ONLY;
import static org.neo4j.driver.v1.Values.ofObject;

public class ListValue extends ValueAdapter
{
    private final Value[] values;

    public ListValue( Value... values )
    {
        if ( values == null )
        {
            throw new IllegalArgumentException( "Cannot construct ListValue from null" );
        }
        this.values = values;
    }

    @Override
    public boolean isEmpty()
    {
        return values.length == 0;
    }

    @Override
    public List<Object> asObject()
    {
        return asList( ofObject() );
    }

    @Override
    public List<Object> asList()
    {
        return Extract.list( values, ofObject() );
    }

    @Override
    public <T> List<T> asList( Function<Value,T> mapFunction )
    {
        return Extract.list( values, mapFunction );
    }

    @Override
    public int size()
    {
        return values.length;
    }

    @Override
    public Value get( int index )
    {
        return index >= 0 && index < values.length ? values[index] : Values.NULL;
    }

    @Override
    public <T> Iterable<T> values( final Function<Value,T> mapFunction )
    {
        return new Iterable<T>()
        {
            @Override
            public Iterator<T> iterator()
            {
                return new Iterator<T>()
                {
                    private int cursor = 0;

                    @Override
                    public boolean hasNext()
                    {
                        return cursor < values.length;
                    }

                    @Override
                    public T next()
                    {
                        return mapFunction.apply( values[cursor++] );
                    }

                    @Override
                    public void remove()
                    {
                    }
                };
            }
        };
    }

    @Override
    public String asLiteralString()
    {
        return toString( VALUE_ONLY );
    }

    @Override
    public Type type()
    {
        return InternalTypeSystem.TYPE_SYSTEM.LIST();
    }

    @Override
    public String toString( Format valueFormat )
    {
        return maybeWithType(
            valueFormat.includeType(),
            formatElements( valueFormat.inner(), values )
        );
    }

    @Override
    public boolean equals( Object o )
    {
        if ( this == o )
        {
            return true;
        }
        if ( o == null || getClass() != o.getClass() )
        {
            return false;
        }

        ListValue otherValues = (ListValue) o;
        return Arrays.equals( values, otherValues.values );
    }

    @Override
    public int hashCode()
    {
        return Arrays.hashCode( values );
    }
}
